Toothed gearing



L. JONES.

TOOTHED GEARING.

APPLICATION FILED JULY 30.1920.

1,383,402; P u ys; 1921,

4 SHEETS-SHEET I.

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L. gumzs. .TOOTHED GEARING.

APPLICATION FILED JULY 30.1920.

Patented July 5, 1921.

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L. JONES. TOOTHED GEARING.I APPLICATION FILED .IULY 30.1-920.

1,383,402. Patented July 5, 1921.

4 SHEETS-SHEET 3.

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L. JONES.

TOOTHED GEARING.

APPLICATION man JULY 30,1920.

Patented July 5, 1921.

4 SHEETS-SHEET 4.

Even for Z a a m e A iifowrre UNITED STATES PATENT OFFICE.

rEMUEL'JoNEs, or AYLEsBURY, ENGLAND.

roo'rmii) GEARING.

Specification of Letters Patent.

Patented July 5, 1921.

To all whom it may concern Be it known that I, LEMUEL JoNns, subject of the King of Great Britain, residing at The SchoolHouse, Bierton, Aylesbury, in the county of Bucks, England, have invented new and useful Improvements in or Relating to Toothed Gearing, of which the following is a specification.

This invention relates to toothed gearing of the kind in whichone of the pair of gear thus reduce geanfriction. With internally geared wheels to which such elementas a pinion is particularly applicable, CGIItIIfH- gally impelled self-lubrication of all-the gearing and gear-bearing surfaces can be utilized to aid the natural tendency of a gear-wheel roller to roll with and over its respective pinion tooth engaging surface, and thus further reduce and minimize gear friction. I

According to the present invention, a roller as a gearing member under the above conditions, is utilized as the generator of the tooth profile or engaging surface of the crown'partsof the teeth of the companion element, hereinafter referred to as the tooth curve and consequently such a 'toothcurve will tendto keep true toshape when in use.

In designingthis tooth curve, a circle of :the diameterof a gearing roller of the roller toothedelement, as the generator, is rolled around a'circle or along a'line tangential with the pitch circle or pitch line of the toothed element with the center of the generating circle constantly on a remoter circle or line equivalent tothe pitch circle or pitch line of the aXesof the rollers of the rollertoothed element, thus differentiatingit from ordinary epicyclic and-hypocyclic toothed curves generated'lby rolling "a generating circle along the pitch'circle of each element. The invention willnow be described with reference to the accompanying-drawing 'whiChi i Fig'ure 1 is a part side elevation ofan internal gear wheel a, in which rollers Z) mounted in cylindrical housings c. are employed in the place of teeth.

Fig. 2 is a part side elevation on a larger scale of a, pinion d to illustrate the present invention.

Fig. 3 is a diagram on'the same scale as Fig. 1.

Fig. 4 is a transverse section of the pinion d on the line 4-4c of Fig. 2 and on the same scale. I

Fig. 5 is a side elevation of a pinion, meshing asa sprocket wheel with a pitch chain.

F g. 6 is an edge view thereof and r F g. 7' is a plan of a portion of the chain.

F g. 8 is a diagram corresponding to Fig. 3, showing the generation of the tooth curve of a pinion for meshing internally with a roller toothed wheel.

tion of the tooth curve of a wheel with which a roller toothed pinion-is to mesh externally;

Fig. 12 is a diagram showing the generation of the tooth curve of a pinion for meshing with a roller toothed rack. V

Fig. 13 is a diagram showing the generation of the tooth curve of a rack with which a roller toothed pinion is to mesh. i

Fig. 14 is a diagram showing the generation of the tooth curve of asprocket wheel with-which a roller chain is to mesh.

b, b (Fig. 2) are two gear wheel rollers in position meshing with two of the teeth 0 of the piniond, meshing internally with the wheel a. f is the pitch circle of the gear wheel, 9 is the pitch circle of the pinion d,

and h is the shaft on which the pinion is mounted.

A gear wheel roller (2 being accommodated in a cylindrical housing c which 1closelyapproximates toit in diameter as shown-in Fig. 1, then such gear wheel roller 6 Figs, 1 and 2 has its axis continuously om the pitch circle f of its gear wheel a, and

1 the pinion tooth curve required for meshing correctly with such a gear wheel roller '7) under these conditions is, according to the present invention, generated by "such gear Wheel roller b. e to a Fig'. 2 is such a The fpi 'o nfteeth'e of pini ons suchascl are intended to be formed in metals that Jwill'take a high degree offinish and polish to work agreeably and smoothly in 3 meshing withhardened polished-metallic rollers b of v their-gearwheels;

curve, herein referred to as the tooth curve, and Fig. 3 illustrates how this pin 'ion toothcurve may bevobtained, and how the pinion (Z is to be mounted to obtain its correct meshing position.

' r i By rolling a generator 2', which in thisin-' :vention is a circle (Fig. 3) of the diameter of a gear wheel roller 'bgaround a circle 9' V which is of less diameter than the pitch cir- 7 generator c', an epicyclic curve is obtained cle f of thefwheel a by' the diameter of-the fora pinion whose pitch circle 9 has its. cencircle 9 would have its center at 70 1'5 iHa'yin V fpinion tooth curves shaped accordingly as r with their'gear wheel a ,rthe pinion (Z must ter at /s Fig1'3.. In Fig. 2 this-pinion pitch Fig.8 shows the generation of the tooth curve; the first portion only of which is used;

provided the pinion teeth with shown ate fee Fig.2, 'to'meshfcorreetly I 'be'mounted so that its axis and the axis. of its shaft hF-i'gQQiS at is? FigsQ Q and 3, and not Fig. 2 shows the upp er complete pinion pinion tooth is eliminated and that as-eniof thetooth curvefit is only necessary'to 'j-shape' and continue the pinion tooth curve indicated figur surface linto bottom clearance; such'as' an 7 'arc likerecessl', Fig. 2.

Apinion tooth 6 may end at 5 6: Fig. 2, as by the dottedline e to e? of this.

.A roller b in passingthroughengagement has a tendency to roll withand over its re- 7 r spective self-generated pinion tooth curve surface e e ',as ind cated by? the arrows :lIl

1 -.Fig; consequently this natural conforming 15Q'uiLCtl0I1fOftWO smoothly'fashioned meshing.

- elements will reduce gear friction: and'in inlternall'y geared wheels gear friction .can be 3 further minimized by centrifugallyimpelled VseIf lubricatiOn of: alllmeshing surfaces f The formiof gear, elements referred to, the

Ii panion.element s,Ia-ndthe method of. assem I bling such elements to mesh together, as de-;. scribed in the, present specification, are. adaptable to various gear -ratios. both,for-

. speed multiplying and speed "reducing; pur

" poses,iwithout restriction asto the number offteeth'provided, v

i As shown in Fig. 9, the internal gear-wheel may have teeth having tooth curves formed iline'of the' axes offsaid rollers. E i

according tothe present invention while the pinionhas the rollers.

The gearing may beexternahin which case i the tooth curve for a pinion is generatedras shown in Fig. 10, while the tooth curve for a'wheel is generatedas shown in'Fig'. 11. V V

The wheelkmay be developedinto arack 'r tion of the tooth curve of'the pinion when the rollers are on the rack, and Fig. l3 shows the generation of the tooth curve of the rack,

which maybe considered to be a wheel or infinite radius. 1 Fig. 12 shows the genera V when the rollers are-on the'pinion. It will be noticed that the circles j. and-f, or"g =as the case may. beybecorne straight lines. v 7

As a'further development, a roller pitch chain may be employed instead of a roller incident withthatof the pinion or sprocket toothed wheel, whichlchain maybe consid-- 1 ered to be a wheel having its' pitch circle co- Thecircle j along Whichfthe generator i rolls;

is, in thiscase of less diameter thanthepitch i the amount of the'di ameter'of the generator. .7 2 while the circle 'fitraversed by'the center 77 rc e 9 10 th Pi n ie pr eke heel; by-

of the generator z'is ofthej same vdiaineter as. if

thepitchcircle g} of the pinion.

use to' conserve .thejcoinciden'ce of ,the1lpitch 7 1' with the pitch circle of the pinion;

. circle. of the rollers*wrapping the 1 pinion For this .reason',"as;. shown in. Figs. .5-7; i 'the 'rollers b 'ofthe'cha'in may 'havelateral flanges n, whichbear against central hosses 0 of thepinion'd, and ,support the rollers '6. Q

against drawing into the'bottom clearances Z betweenthe roots of T the teeth. 1 V 1 Iclaimri --5-1.;A methodof-formingthe engaging-sur- I :faces' of -and} mounting af toothed element to mesh with a rollertoothed-element,con

sisting in generating the crownpartsaof the; V V engagingsurfaces of said 'teeth 'by -rolling a generatingcircle'ofthediameterfof said remoter line equivalent to *the pit ch line of with f-its pitch linetangential to 29A. method er formingthe s a m siir; fmethod offorming'the teeth of their com- T T1720 faces of'and mouhtingetojo i tlle en Y mesh with a roller-toothedelementfconsist 1 ing ingenerating' the crown partszzof "the engaging surfaces "oftsaid"teeth'byirolling a generating circlefof ,theligdiameteriiof said l-rollersaround 'a circle itaingentia1"with the a-pitch circleiofsaid toothedelementwith the s 7 7' center of said generating circle constantlyionf",

-a remoter circle equivalent to the pitch' cin' ole of the axes iofsaid rollers, and mounting; 1 0

said toothed element with its pitch circle tangential to the pitch circle of the axes of said rollers.

3. A method of forming the engaging surfaces of and mounting a toothed pinion to mesh internally with a roller-toothed wheel, consisting in generating the crown parts of the engaging surfaces of said teeth by rolling a generating circle of the diameter of said 10 rollers around a circle tangential with the pitch circle of-said pinion with the center of said generating circle constantly on a remoter circle equivalent to the pitch circle of the axes of said rollers, and mounting said pinion with its pitch ciro'le internally tangential to the pitch circle of the axes of said rollers.

In testimony whereof I have signed my name to this specification.

' LEMUEL JONES. 

